Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 588	$ 1,828	$ 1,416	$ 2,301
Other comprehensive income:
Change in gross unrealized investment gains/losses	136	358	(184)	266
Effect of income taxes	(31)	(85)	42	(63)
Total change in unrealized investment gains/losses, net of tax	105	273	(142)	203
Reclassification adjustment for net realized gains	(9)	(2)	(64)	(47)
Effect of income taxes	2	0	15	10
Total reclassification adjustment, net of tax	(7)	(2)	(49)	(37)
Other comprehensive gain (loss), net of tax	98	271	(191)	166
Comprehensive income (loss) attributable to equity method investments	10	(2)	16	(5)
Comprehensive income	$ 696	$ 2,097	$ 1,241	$ 2,462